The only real downside of the VidHD that I've experienced so far is that the FloppyEmu attached to the IIe shows an error on power up, as seen here.
At first I thought that there was a conflict with the floppy controller, but it appears to be a timing issue that's easy to work around.
If I power cycle the FloppyEmu after the IIe is up, it becomes available again with no error, and I can reboot the IIe and boot from it, as long as I don't power cycle everything.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko